Setting tool for bolt anchor



0611. 14,. 1969 c CHANCE SETTING TOOL FOR BOLT ANCHOR Filed March 20, 1968 liiliii l V INVENT-OR 772 G Za/ww United States Patent M 3,472,052 SETTING TOOL FOR BOLT ANCHOR Harold C. Chance, 3417 Sandra Drive, Shreveport, La. 71109 Filed Mar. 20, 1968, Ser. No. 715,483 Int. Cl. B21d 9/07 US. Cl. 72-114 4 Claims ABSTRACT OF THE DISCLOSURE A tool for setting anchors of the type having an expansible sleeve of soft metal and wherein the tool causes expansion of the sleeve about the anchor located in a hole in brick, stone or cement-like material to secure the anchor in place. A portion of the tool is adapted to be hammered by an operator to expand the sleeve about the anchor.

The present invention pertains to a tool for setting bolt anchors in walls of brick, stone or cement-like material not readily adapted to receive a threaded bolt within itself.

The type of anchor used consists in an inner threaded member of comparatively hard material and an outer sleeve of comparatively soft material, the outer sleeve adapted to expand upon being tamped by a tool or hammer so as to wedge the inner member in a prepared hole.

The failing of the former inventions of the abovementioned type has not'been in the anchor itself but in the installation thereof. Heretofore, all of the anchors have been made to rest upon the bottom of the hole and to use this as a means of support as the outer sleeve is tamped into wedging position. It is well known that in drilling concrete or stone, it is diflicult enough to maintain a round hole of a given size, much less be held to a close tolerance on the depth of the hole. Moreover, nearly all of the drills are provided with a tapered point, whereas the most suitable hole for anchors is one produced by a drill having a flat point. Again, if the hole is drilled too deep, the final assembly of the anchor may be down in the hole beyond the reach of the screw or bolt for which it was prepared. If the hole is too shallow, a portion of the assembled anchor may protrude above the surface of the hole and interfere with some member of the assembly held by the bolt.

In the present invention, it is the primary object of the invention to provide an anchor and tool for assembling the same whereby the anchor may be expanded in a prepared hole of a given diameter but with no regard as to the depth of the hole.

It is a further object of the invention to provide a tool for setting bolt anchors which suspends the anchor in a prepared hole and permits setting the anchor at a given, precise depth with respect to the surface of the hole.

Further objects and advantages of the invention will become more apparent in the course of the following detailed description when viewed together with the accompanying drawing in which:

FIG. 1 is an elevational view of the invention in an anchor setting tool.

FIG. 2 is a cross sectional view of the conventional anchor as used comprising an inner expanding member and a relatively soft metal outer sleeve.

FIG. 3 is a cross sectional view of the invention taken along lines 3--3 of FIG. 1.

FIG. 4 is a sectional view similar to that of FIG. 3 but showing the device suspending the anchor in a prepared hole.

FIG. 5 is a broken, sectional view similar to that of 3,472,052 Patented Oct. 14, 1969 FIG. 4 and showing the positions of the various setting tool components immediately following the setting operation and FIG. 6 is a broken sectional view of the anchor showing its position with respect to the surface of the hole after setting and with the setting tool removed.

In the drawing numeral 10 designates a tubular outer body of the invention which is made preferably of some tough metallic material. Nested loosely inside the outer body 10 is a setting sleeve designated generally by the numeral 11.

As shown in FIG. 3 the setting sleeve is provided with a solid driving head 12 and a tubular shank portion 13. At the upper end of the outer body 10 there is a crossbar 14 having its end firmly anchored in the side walls of the outer body 10 and projecting transversely through an elongated slot 15 provided in the side walls of the shank portion 13 of the setting sleeve 11.

Pivotally affixed to the cross-bar 14 so as to be suspended downwardly along the central vertical axis of the device is an anchor holding rod 16 provided with threads 17 matching those of the anchor.

The anchor is seen in cross section in FIG. 2 and consists in an inner threaded member 18 which has a round base section 19 and a tapered section 20 which finally terminates in a upstanding shank portion 21. The shank portion 21 is threaded, of course, to receive the lower end of the anchor holding rod 16 of the setting tool. Slidably positioned over the shank portion 21 of the threaded member 18 is an outer sleeve 22 made of a material substantially shofter than the inner threaded member 18. The length of the sleeve has been previously calculated to extend normally above the uppermost end of the threaded member 18 at one end and to rest at the diverging point of the tapered section 20 at its other end. The diameter of the prepared hole and the diameter of the outer sleeve 22 have been previously calculated to such dimensions that when the sleeve is expanded by forcing the same downwardly over the tapered section 20, the sleeve will then become wedged between the walls of the prepared hole and the inner threaded member, thus assuming the general shape as illustrated in FIG. 6.

To illustrate the use and advantage of the present invention, reference is now made to FIG. 4. Let it be assumed that a hole 23 has been drilled in a portion of a concrete floor 24 to receive a screw. The hole diameter is, of course, matched to the anchor size as formerly described. No regard, however, is given to the depth, so long as it is slightly deeper than the length of the anchor. The unexpanded anchor is then threaded on to the bottom end of the rod 16. In the illustration it can be seen that the length of the rod 16 and its threaded make-up with the anchor is such that the lower end of the driving member 12 rests against the upper end of the expandable sleeve 22. It will also be noted that the length of the supporting rod 16 is such that the shank portion 13 of the driving sleeve 12 is raised slightly from its downmost position, leaving a slight opening 25 in the slot 15 above the cross member 14. The outer sleeve 10 encircles the drilled hole 23 with its bottommost end resting on the flat floor surface 26 immediately surrounding the hole 23.

Now, by striking the upper head portion 12 of the striking sleeve 11, the outer sleeve 22 of the anchor is driven against the tapered portion 20 of the inner threaded member 18 and made to expand against the sidewalls of the prepared hole 23 as illustrated in FIG. 5. It will be noted that the action just described did not depend upon the bottoming of the inner threaded member 18 in the hole 23 to expand the sleeve around it as taught by the prior art, but in this instance the inner sleeve was held suspended in the hole by the rod 16 while the outer sleeve was expanded into a setting position.

As pointed out in the introduction to this specification, it is a feature of the present invention to deviate from the old art of having to place a bolt anchor at the bottom of a carefully drilled hole for its subsequent setting therein.

Since all of the components are prevented from rotating around the vertical axis with respect to one another by the cross member 24, the entire setting tool may be disconnected from the anchor simply by unthreading the rod 13 from the inner member 18 of the bolt anchor in the normal manner.

The finished anchor, as set for service, will assume the section as illustrated in FIG. 6. Here, the anchor is wedged tightly in a bottomless hole 23 but with the upper end thereof nice and flush with face 26 of the hole and ready to receive the screw for which it was prepared.

While the above description and drawings disclose an anchor bolt tool on a given configuration and construction, it will be remembered that this has been by way of example only, and that other forms of construction could be made without departing from the spirit and scope of the invention as defined by the following claims.

I claim:

1. A tool for setting anchors having an expanding member and an expansible sleeve of relatively soft metal surrounding said expansible member, said tool comprising a hollow body portion, means attached to said body portion for suspending said anchor in a hole, and elongated driving sleeve having one end adapted to be hammer driven and an opposite end provided with an annular surface adapted to engage the surface of said expansible member.

2. A setting tool for use with a bolt anchor comprising a non-expandable member, and expandable sleeve of relatively soft metal surrounding said non-expandable member, said tool comprising a tubular outer body portion, a hollow plunger adapted to engage the bolt anchor at one end and provided with driving head at the other end, a supporting rod in said hollow plunger, said rod adapted for threadedly engaging said anchor, said rod being stationary with respect to the slidable movements of said hollow plunger.

3. A tool for setting bolt anchors having a threaded inner member, an expansible sleeve of relatively soft material surrounding said inner member, said tool comprising a hollow body portion, a supporting means attached to said body member for supporting said anchor in a prepared hole, an elongated driving sleeve also in said body member and movable along the axial plane of said tool with respect to said body member and said anchor supporting means, said driving sleeve being engageable with said expansible sleeve at one end thereof and provided with a driving head at its opposite end.

4. A tool for setting bolt anchors in concrete or the like having a threaded inner member, an expansible sleeve surrounding said inner member, said tool comprising an outer body, an inner rod lying along the axial plane of said body and provided with a threaded end for engagement with the inner threaded member of said anchor, said rod being attached to said outer body and adapted to suspend said bolt anchor in a hole over which said outer body is positioned, a driving sleeve surrounding said rod but also within said outer body, said sleeve being slidable with respect to said rod and said outer body, one end of said driving sleeve adapted for contact with said expansible sleeve whereby the same may be expanded by said movable sleeve while said member is held in a stationary position by said rod.

References Cited UNITED STATES PATENTS 1,177,843 4/1916 Ackerman 72-391 2,155,542 4/1939 Graham 72--391 2,519,693 8/1950 Olin 72-391 2,562,419 7/ 1951 Ferris 72454 2,995,266 8/1961 Crawford 72-391 3,166,210 1/1965 Nelson 72454 CHARLES W. LANHAM, Primary Examiner GENE P. CROSBY, Assistant Examiner U.S. Cl. X.R. 29264; 72-391 

